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MCQs 1: The core used in high frequency transformer is usually___________?

copper core cost iron core air core mild steel core
Answer Explanation

MCQs 2: In a transformer the resistance between its primary and secondary is____________?

zero 1 ohm 1000 ohms infinite
Answer Explanation

MCQs 3: Harmonics in transformer result in___________?

increased core losses increased I2R losses magnetic interference with communication circuits all of the above
Answer Explanation

MCQs 4: Helical coils can be used on___________?

low voltage side of high kVA transformers high frequency transformers high voltage side of small capacity transformers high voltage side of high kVA rating transformers
Answer Explanation

MCQs 5: The function of conservator in a transformer is___________________?

to project against’internal fault to reduce copper as well as core losses to cool the transformer oil to take care of the expansion and contraction of transformer oil due to variation of temperature of sur-roundings
Answer Explanation

MCQs 6: The thickness of laminations used in a transformer is usually____________?

0.4 mm to 0.5 mm 4 mm to 5 mm 14 mm to 15 mm 25 mm to 40 mm
Answer Explanation

MCQs 7: Material used for construction of transformer core is usually___________________?

wood copper aluminium silicon steel
Answer Explanation

MCQs 8: Hysteresis loss in a transformer varies as CBmax = maximum flux density) ?

Bmax Bmax1-6 Bmax1-83 B max
Answer Explanation

MCQs 9: The noise resulting from vibrations of laminations set by magnetic forces, is termed as_________________?

magnetostrication boo hum zoom
Answer Explanation

MCQs 10: The transformer ratings are usually expressed in terms of______________?

volts amperes kW kVA
Answer Explanation

MCQs 11: An ideal transformer has infinite values of primary and secondary inductances. The statement is______________?

true false
Answer Explanation

MCQs 12: The chemical used in breather is_______________?

asbestos fiber silica sand sodium chloride silica gel
Answer Explanation

MCQs 13: The chemical used in breather for transformer should have the quality of____________?

ionizing air absorbing moisture cleansing the transformer oil cooling the transformer oil
Answer Explanation

MCQs 14: The use of higher flux density in the transformer design____________?

reduces weight per kVA reduces iron losses reduces copper losses increases part load efficiency
Answer Explanation

MCQs 15: In a transformer the tappings are generally provided on_____________?

primary side secondary side low voltage side high voltage side
Answer Explanation

MCQs 16: What will happen if the transformers working in parallel are not connected with regard to polarity ?

The power factor of the two trans-formers will be different from the power factor of common load Incorrect polarity will result in dead short circuit The transformers will not share load in proportion to their kVA ratings none of the above
Answer Explanation

MCQs 17: If the percentage impedances of the two transformers working in parallel are different, then______________________?

transformers will be overheated power factors of both the transformers will be same parallel operation will be not possible parallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the
Answer Explanation

MCQs 18: If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be___________?

R2/VK R2IK2 R22 R22/K
Answer Explanation

MCQs 19: Two transformers operating in parallel will share the load depending upon their____________?

leakage reactance per unit impedance efficiencies ratings
Answer Explanation

MCQs 20: The power transformer is a constant______________?

voltage device current device power device main flux device
Answer Explanation

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